Description
A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40, USG FLEX series firmware versions from V4.50 through V5.40, USG FLEX 50(W) series firmware versions from V4.16 through V5.40, and USG20(W)-VPN series firmware versions from V4.16 through V5.40 could allow an authenticated attacker with administrator privileges to execute operating system (OS) commands on the affected device by passing a crafted string as an argument to a CLI command.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Zyxel | ATP series firmware | versions from V4.32 through V5.40 | — |
| Zyxel | USG FLEX series firmware | version from V4.50 through V5.40 | — |
| Zyxel | USG FLEX 50(W) series firmware | versions from V4.16 through V5.40 | — |
| Zyxel | USG20(W)-VPN series firmware | versions from V4.16 through V5.40 | — |
Advisories 1
- WID-SEC-2025-2346 Zyxel Firewall: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 20, 2025